I would like to say that the issue below seems to be exactly what is happening to me. BUT the only thing I can find is a hotfix for Excel 2010 and I need it for Excel 2013. Any assistance would be greatly appreciated. Thank you,
Quoted text from the referenced post follows in bold:
This issue occurs because Excel 2010 tries to delete the temporary copy of the original workbook on the UNC
share.
When a user saves an Excel workbook to a UNC share location, Excel 2010 creates a temporary copy of the workbook. In the final step of the saving process, Excel 2010 deletes the original Excel workbook and replaces it with a temporary copy. If Delete permissions are not granted to the user, Excel 2010 cannot complete the saving process, and the user receives the error message that is mentioned in the "Symptoms" section.
To resolve this issue, apply the following update:http://support.microsoft.com/kb/2553034
Source link: http://support.microsoft.com/kb/2589410
More information about troubleshooting errors when you save Excel files, please visit here:
https://support.microsoft.com/kb/271513
Tony Chen
TechNet Community Support